Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

25559 results found.

  1. GRB 090529: MITSuME optical observation
  2. GRB 090530: GRT Optical Observation
  3. GRB 090531B: Swift-BAT refined analysis
  4. GRB 090531B: Swift detection of a burst
  5. GRB 090531: Swift-BAT refined analysis
  6. GRB090530: R-band Observation
  7. GRB 090530: break in light curve
  8. GRB 090529: VLT spectroscopic redshift
  9. GRB 090531: Swift detection of a burst
  10. GRB 090529: NOT optical observations
  11. GRB090530: Swift XRT refined analysis
  12. GRB 090529: Swift-XRT refined analysis
  13. GRB 090529: OSN optical observations
  14. GRB 090528B: Fermi GBM detection
  15. GRB 090528: Fermi GBM detection
  16. GRB 090530: Enhanced Swift-XRT position
  17. GRB 090530: Swift-BAT refined analysis
  18. GRB 090530: Swift detection of a burst with an optical counterpart
  19. GRB 090529: TLS Afterglow Observations
  20. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  21. GRB 090529: Swift-BAT refined analysis
  22. GRB 090529: Enhanced Swift-XRT position
  23. GRB 090529: Swift detection of a burst
  24. GRB 090520D: Fermi GBM detection
  25. GRB 090520C: Fermi GBM detection
  26. GRB 090520B: Fermi GBM detection
  27. GRB090518B optical limit by "Pi of the Sky"
  28. GRB 090522 : Fermi GBM detection
  29. GRB 090524: Fermi GBM detection
  30. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  31. GRB 090518: Fermi GBM detection
  32. GRB 090516C: Fermi GBM detection
  33. GRB 090423: Fermi GBM T90 follow-up analysis results
  34. GRB 090516: Fermi GBM observation
  35. GRB 090516B: Fermi GBM detection
  36. GRB 090519B: Fermi GBM detection
  37. GRB 090519: Swift-XRT refined analysis
  38. GRB 090519: NOT refined analysis
  39. GRB 090519: VLT spectroscopic redshift
  40. GRB 090519, Swift-BAT refined analysis
  41. GRB 090519: Enhanced Swift-XRT position
  42. GRB 090519: NOT afterglow candidate
  43. GRB 090519: FARO Chante Perdrix Observatory optical observations
  44. GRB 090519: TAROT Calern observatory optical observations
  45. GRB 090519: Swift detection of a burst
  46. GRB 090511: Fermi GBM Detection
  47. GRB 090514: Fermi GBM detection
  48. GRB 090518, Swift-BAT refined analysis
  49. GRB 090518B: Fermi GBM detection
  50. GRB090513: Fermi GBM detection
  51. GRB090518 : Optical upper limit by MOA-II telescope
  52. GRB 090518: Swift-XRT refined analysis
  53. GRB 090518: Enhanced Swift-XRT position
  54. GRB 090518: Swift detection of a burst
  55. GRB 090516: Swift-BAT refined analysis
  56. GRB 090516: VLT spectrum (correction & update)
  57. GRB 090516: Swift XRT refined analysis
  58. GRB 090516: Enhanced Swift-XRT position
  59. GRB 090516: Swift detection of a burst
  60. GRB 090515: ROVOR Upper Limit
  61. GRB 090515: Swift-XRT refined analysis
  62. GRB 090515: Enhanced Swift-XRT position
  63. GRB 090509: Fermi GBM observation
  64. GRB 090515: Swift-BAT refined spectral analysis
  65. GRB 090515: Swift-BAT refined analysis
  66. GRB 090509 - Zadko Telescope observations
  67. GRB 090515: KAIT optical upper limits
  68. GRB 090515: Swift detection of a short burst
  69. GRB 090510: Suzaku WAM observation of the prompt emission
  70. GRB 090510, Radio limits
  71. GRB 090510: GROND observations
  72. GRB 090510: Fermi-LAT follow-up analysis
  73. GRB 090509, further Swift-BAT refined analysis
  74. GRB 090502: Fermi GBM detection
  75. Konus-Wind observation of GRB 090510
  76. AGILE detection of GRB 090510
  77. GRB 090510: UVOT refined analysis
  78. GRB 090510: Swift XRT refined analysis
  79. GRB 090510: Enhanced Swift-XRT position
  80. GRB 090510: NOT afterglow confirmation
  81. GRB 090510: Swift-BAT refined analysis
  82. GRB 090510: Fermi GBM detection
  83. GRB 090509: Swift-BAT refined analysis
  84. GRB 090510: Swift detection of a short hard burst
  85. GRB 090509: Swift detection of a burst
  86. GRB 090323: optical observations
  87. GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
  88. GRB 080913: 250 GHz upper limit for a z=6.7 GRB with MAMBO-2 at the IRAM 30m
  89. GRB 090427: GROND observations
  90. GRB 090429A: ROVOR magnitude limit
  91. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  92. GRB 090428B: Suzaku WAM observation of the prompt emission
  93. GRB 090426: optical observations
  94. GRB 090429D: Fermi GBM detection
  95. GRB 090429C: Fermi GBM detection
  96. GRB 090427: pseudo-z= 1.48 from prompt emission spectrum
  97. GRB 090429B: Gemini-N further nIR observations
  98. GRB 090424: YNAO-GMG observations
  99. GRB 090429A: Swift-XRT refined analysis
  100. GRB 090427C: Fermi GBM detection

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov